Razor



Aug. 20, 1940. M. GRIVETTO ,11

RAZOR Filed March 12, 1936 Z Sheets-Sheet 1 UMMWM-W ATTURACZ'XS g- 20,1940- I M. GRIVETTO 2,212,117

RZ-OR Filed Mairch 12, 1936 2 Sheets-Sheet 2 Fig. 7

By jab/ WM? 62W!) Patented Aug. 20, 1940 RAZOR Michele Grivetto, Turin,Italy, assignor to Societa.

Scientifica Radio Brevetti Ducati, Bologna,

Italy Application March 12; 1936, Serial No. 68,397

In Germany March 19, 192' 1 2 Claims. (01. 30-43)" Shearing devices foreffecting a shaving cutso-called ,dry shavers-comprise generally askin-contacting slotted shear. plate or stationary comb and a similarlyslotted cutter or movable comb lying against the reverse face of theshear plate and reciprocated transversely, so that hair 15 It is themain object of this invention to-improve devices of this kind in suchmanner as to eliminate completely the danger of injury to the skinwithout prejudicing the cutting of the hair directly at its. root.

20 the movable comb forms an obtuse angle at the above mentioned edge ofthe stationary comb and the face of the movable comb extends directlyover the skin surface as far as the protecting member, the protectingmember serving the pur- 25 pose of stretching and holding the skin toprevent its being caught and consequently injured. The movable comb mayalso form an obtuse angle at the edge of the protecting member and grazethe back of the protecting member with the 80 oblique surface thusformed. In this case, a form of the device is obtained in which thebottom, skin-contacting surfaces of the stationary comb, the movablecomb and the protecting memher are substantially in'the same-plane sothat 35 the cutting surface attains a zero value and the operates withthat part of the front surface of the movable comb which extendsupwardly at an obtuse angle to the skin-contacting plane, the 5stationary comb extending as far as the apex of said obtuse angle.

The annexed'drawings show diagrammatically three forms of the razoraccording to this invention. 50 Figures 1 and 2 show the first form.Figure 1 is a longitudinal section of the complete razor.

Figure 2 shows on a larger scale a cross section of the cutting combsand a perspective view of the parts arranged behind the section plane.55 Figures 3 to 8 show a second form. Fig. 3

According to this invention is a cross section of the razor head; Fig. 4is a plan View of the stationary cutting comb; Fig. 5 is a bottom viewof the movable cutting comb and Fig. 6 is a side view thereof. Figures'7 and 8 show two modified details. 5

Figures 9 and 10 show a third form. Fig. 9 is a cross section of therazor head; Fig. 10 is a partial plan thereof.

In an oval casing I (Fig. 1) is housed an electric motor 2, whichimparts to a slide 4 through an 10 eccentric 3, a reciprocating movementin the di rection of the double arrow seen in Fig. 2, that is tosayperpendicularly to the plane of the drawing. The lower part of theslide 4 is slotted and constitutes the-movable cutting comb; the lowerends of its teeth 5 are of trapezoidal form. Said ends slide along theirside surfaces So on the cor-. respondingly slanted surfaces 511 and laof two branches 8 of a lyre-shaped piece secured to the casing l. Thelower endsof the branches 8 are slotted and form the teeth 6 and Iconstituting two stationary cutting combs.

The lower surfaces 5b and lb are preferably plane, at any rate smooth,so that they slide easily on the skin. Be-

tween the edges 60 and 10 formed by the intersection of the surfaces 6aand 5b and 1a, lb respectively, is provided a slot 9, in which slide thesmaller base surfaces 5b of the trapezoidal teeth of the movable comb.

When the razor is passed over the skin with the movable comb 4, 5oscillating continuously, the

hair which enters the slits between the teeth 5 and I, respectively, isout between the surfaces 5a. and 5a, la, respectively, and it isshortened several times, because the nearer the edge Go or 1c is broughtto the hair, the nearer is the cutting point of the hair to the skin.Theoretically speaking, the cutting surface and the skin surface meet atthe edges 5c and 10, so that practically the hair is shaved directly atits root;

The skin is in contact with-the movable comb 4 4, 5 only inside the slot9. .On the two margins of said slot, surfaces 6b and 1b are providedwhich stretch the skin preventing wounds or scratches. It will be seenthat only one branch of the piece 8 need be in the form of a cuttingcomb while the other'branch may be in the form of a solid piece servingto press down the skin; the razor would in such case be moved .only inone direction, all other advantages being maintained.

According to the form shown in Figures 3 to 8 the teeth 5 of themovablecomb are hammershaped. Otherwise this form is similar to that shown inFigures 1 and 2. l

The teeth 5 of the movable comb shown in Figure 8 are provided withlower shallow grooves 575, this having-the advantage of substantiallypreventing any contact between the skin and movable cutting comb.

In order to prevent the teeth 5 from entering the spaces between theteeth 6 and I, the pitch of the teeth 5, in the example shown in Fig. 5,is not uniform over the whole length of the comb but varies from rightto leftfrom a minimum to a maximum. Obviously the pitch might beincreased from left to right and vary several times between a minimumand a maximum.

In view of the fact that the distance between the teeth 6 and 1 is aconstant one, there is a sufficient support for the piece 4, 5 on theback So, Ia of the teeth 6 and 1.

In a modification the pitch of the teeth of the stationary comb may varyover the length of the comb.

According to the form shown in Figure 7, the teeth 5 of the movable combare, as seen in plan view, inclined relatively to the teeth 6, 1 of thestationary comb. As shown in the drawings, the stationary teeth 8, I arearranged in a normal direction and the movable teeth 5 are deviatedtherefrom. This arrangement may be reversed or the teeth of both combsmaybe deviated from the normal direction.

The angle of deviation may of course be narrower or wider than thatillustrated in the drawings. It is also possible to combine thearrangements shown in Figures 5 and 7 that is to say to provide inclinedteeth of variable pitch or make the teeth of a comb inclined and theteeth of the other comb with a variable pitch.

According to the form shown in Figures 9 and 10, the razor head isapproximately of T-shaped section like ordinary safety razors. The plateI2 is secured to a support 10 by means of screws I I. Each of itslongitudinal edges is in the form of a stationary cutting comb 6. Thesame support carries a plate l3 kept against rotation and longitudinaldisplacement; its longitudinal edges are indented and form a secondstationary piece sliding on the skin. A plate 4 each of the longitudinaledges of which forms a. movable cutting comb 5 is arranged between thestationary plates l2 and I3 and performs a reciprocating movement in thedirection of the double arrow, seen in Fig. 10.

The leaf springs I5 press the plate l3 against the plate 4 andconsequently this latter against the plate 12. The skin is designated bydotted lines l6.

In this construction the back of the teeth of the stationarycomb 6 isalso slanted transversally to the direction of oscillation of themovable comb to form an edge 60 which is grazed by the movable comb 5.The edge 6c lies also on the nearly plane surface 612 of the stationarycomb 6 and the movable comb 5 extends beyond said edge 60 to the otherpiece 1, l3 sliding on the skin and is supported thereby.

What I claim is:

1. A razor, comprising in combination a motor, a lyre-shaped member, thebranches of which form two spaced stationary cutting combs havingsurfaces slidable on the skin and extending at least nearlyperpendicular to the axis of said lyre-shaped member, the back surfacesof said stationary cutting combs being inclined in opposite directionsto form with the surfaces slidable on the skin, sharp edges lying in alongitudinal direction of the stationary cutting combs, a movablecutting comb within said lyre-shaped member, operated by said motor,performing a reciprocating movement in a longitudinal direction andprovided with trapezoidal shaped teeth the sides of which graze saidslanted back surfaces of the stationary cutting combs and the 5 smallerbase surfaces of which slip along in the space between said edges of thestationary cutting combs.

2. A razor, comprising in combination a motor, a stationary cutting combslidable on the skin 10 and a movable cutting comb operated by the motorand performing a reciprocatory movement on the back surface of thestationary comb, said back surface being inclinedto the skin-contactingsurface of the stationary comb to form an 15 edge lying in the directionof oscillation and in 'proximity to the movable comb, and a secondstationary member slidable on the skin and situated within a shortdistance from said edge, the pitch of the teeth of one of the cuttingcombs 20 being constant while that of the teeth of the other cuttingcomb varies over the length ofthe comb from a minimum to a maximum.

3. A razor, comprising in combination. a motr, a stationary cutting combslidable on the skin 5 and a movable cutting comb operated by a motorand performing a reciprocatory movement on the back surface of thestationary comb, said back surface being inclined to the skin-contactingsurface of the stationary comb to form an edge lying 30 in the directionof oscillation and in proximity to the movable comb, and a secondstationary member slidable on the skin and situated within a shortdistance from said edge, the pitch of the teeth of the stationary'combbeing constant and 35 the pitch of the teeth of the movable comb varyingover the length of the comb.

4. A razor, comprising in combination a motor, a T-shaped member atleast one flange of which forms a stationary cutting comb slidable onthe skin, a second plate operated by said motor performing anoscillatory movement and positioned adjacent to the flange of saidT-shaped member, at least oneportion of which second .plate forms. amovable cutting comb, the surface of which 45 adjacent to saidstationary comb forms an obtuse-angled edge with its surface slidable onthe skin, a third plate fixed on said T-shaped member adjacent to themovable comb plate and forming a second stationary member slidable on50- the skin, the back of the flange of said T-shaped member grazed bythe oscillating plate being inclined to its surface slidable on the skinto form a sharp edge lying in the direction of oscillation and inproximity to said obtuse-angled edge of 55 the movable cutting comb.

5. A razor, comprising in combination a motor, a stationary cutting combhaving a back surface and a surface slidable on the skin and a movablecutting comb operated by said motor and performing a reciprocatorymovement, said movable comb having a bottom surface and a shearingsurface which form an obtuse-angled edge lying in the direction ofoscillation of the movable comb, the shearing surface slidable on saidback surface of the stationary comb, said back surface being inclined tothe skin-contacting surface of the stationary comb to form an edge lyingin the direction of oscillation and in 70 proximity to saidobtuse-angled edge of the movable comb, and a second stationary membersit-' uated within a short distance from said edge of the stationarycomb and having a surface slidable on the skin and being approximatelyflush with the surface of the stationary comb sliding on the skin.

6. A razor, comprising in combination a motor, a movable cutting comboperated by said motor, performing a reciprocatory movement and hav-,ing a bottom surfaceand two side surfaces which form obtuse angled edgeswith said bottom surface, a stationary cutting comb having a sur---flush with one another.

'7. A shaving implement comprising a tapered vibratory shear plate, astationary shear plate overlying the vibratory plate, defining therewiththe shearing plane of the implement and extending beyond the edge of thevibratory plate, the two plates presenting a skin-engaging surface ofsubstantial area which lies in a single plane inclined at an acute angleto the shearing plane and which includes their common line of contact,said surface being effective for tensioning the skin being shaved.

8. A shaving implement comprising a movable plate presenting askin-engaging face, and a stationary plate, both plates having edgerecesses forming shear teeth, the plates being superposed and taperingto a common vertex offset with respect to their plane of contact andlocated in the stationary plate and presenting jointly a skinengagingface of substantial area lying in a single plane.

' 9. A razor, comprising in combination a mo tor, "a stationary cuttingcomb having a facecontacting surface and a back surface, and a movablecutting comb operated by said motor and performing a reciprocatorymovement, said movable comb having a face-contacting surface and ashearing surface forming an obtuse-angled edge extending in thelongitudinal direction of the head of the razor, the shearing surfacebeing slidable on the back surface of the stationary comb, said backsurface being inclined to said skin-contacting surface of the stationarycomb and forming an acute-angled edge extending in the longitudinaldirection of the head of the razor, the face-contacting surfaces of thestationary and movable combs being in substantially the same plane.

10. A razor, comprising in combination a mo- 3 tor, two stationarycutting combs arranged side by side and slidable on the skin and amovable cutting comb operated by-said motor and'pe rforming areciprocatory movement, said movable comb having a bottom surface andtwo inclined side surfaces which form obtuse angles with said bottomsurface, the two side surfaces sliding on the back surfaces of thestationary combs, said back surfaces being inclined in oppositedirections to the skin-contacting surface of the stationary comb to formedges lying in the direction of oscillation,, said edges being grazed bythe obtuse-anglededges of the movable comb.

11. A razor; comprising in combination amotor, a stationary cutting combslidable on the skin 'and a movable cutting comb operated by said motorand performing a reciprocatory movement,

said movable comb having a bottom surface and a shearing surface whichform an obtuse-angled edge lying in the direction of oscillation of themovable comb, theshea-ring surface being slidable on the back surface ofthe stationary comb, said back surface being inclined to theskin-contacting surface of the stationary comb to form an edge lying inthe direction of oscillation and in proximity to said obtuse-angled edgeof the movable comb, and a second stationary member slidable on the skinand situated within a short distance from said edge of the stationarycomb, the pitch of the teeth of the stationary comb being other than thepitch of the teeth of the movable comb, so that the movable teeth cannotenter the spaces between the teeth of the stationary comb.

12. A razor, comprising in combination a motor, a stationary cuttingcomb slidable on the skin and a movable cutting comb operated by I saidmotor and performing a reciprocatory'movement, said movable comb havinga bottom surface and a shearing surface which form an obtuse-angled edgelying in the direction of oscillation of the movable comb, the shearingsurface being slidable on the back surface of the stationary comb, saidback surface being inclined to the skin-contacting surfaces of thestationary comb to form an edge lying in the direction of oscillationand in proximity to said obtuse-angled edge of the movable comb, and asecond stationary member slidable on the skin and situated within ashort distance from said edge of the stationary comb, the teeth. of oneof the cutting combs being, as seen in plan view, inclined with respectto the teeth of the other comb, so that the teeth of the movable combcannot enter the spaces between the teeth of the'stationary comb.

MICHELE GRIVETTQ-

